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Lens barrel and method for manufacturing the same

a technology of lens barrel and lens body, which is applied in the field of lens barrel, can solve the problems of failure of engagement of the interchangeable lens of the prior art, and achieve the effect of improving assembly accuracy

Inactive Publication Date: 2010-02-16
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a lens barrel with improved accuracy of assembly. This is achieved by integrating a supporting part with a stationary part, to which a movable part is fixed, and a rotary member that transfers a driving force to the movable part. The rotary member may be a gear train, with a first gear and a final gear meshed with a movable part side gear. The rotary member may be arranged in parallel with an optical axis of the lens, and the output axis and the rotary axis may be arranged around an axis having its center at the optical axis or its vicinity. The lens barrel may also include a plurality of rotary members arranged in parallel with the optical axis of the lens. The invention allows for improved accuracy of assembly and reduced assembly errors.

Problems solved by technology

However, this interchangeable lens of the prior art may be subject to engagement failure between the gear train and a gear provided for a driven member due to an assembly error of the driving unit with respect to the stationary tube.

Method used

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  • Lens barrel and method for manufacturing the same
  • Lens barrel and method for manufacturing the same
  • Lens barrel and method for manufacturing the same

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first embodiment

[0036]Now, a more detailed explanation will be given with reference to the drawings and more according to embodiments of the present invention. It should be noted that the following embodiments will be explained by taking an interchangeable lens as an example of a lens barrel.

[0037]The interchangeable lens of the first embodiment forms a camera system together with a camera body (not shown), and is configured to be detachably fitted to the camera body. The interchangeable lens can switch between an AF mode for performing a focusing operation according to publicly-known AF (auto focus) control, and an MF (manual focus) mode for performing a focusing operation in dependence on a photographer's manual input.

[0038]FIG. 1 shows an exploded perspective view showing the interchangeable lens of the first embodiment.

[0039]FIG. 2 is a cross-partial view including the optical axis of the interchangeable lens shown in FIG. 1. FIG. 2 shows a portion including a final gear (described later) provi...

second embodiment

[0081]Next, an explanation will be given concerning the second embodiment of the present invention. In the second embodiment, every element serving a function similar to that in the above-described the first embodiment is denoted by the same reference symbol or a reference symbol having consistent final numbers, for appropriate omission of overlap of the description and drawing.

[0082]FIG. 4 is an exploded perspective view showing an interchangeable lens of the second embodiment.

[0083]FIG. 5 is a cross-partial view including an optical axis of the interchangeable lens shown in FIG. 4.

[0084]The interchangeable lens 101 of the second embodiment is different from the first embodiment in which the stationary tube 40 provided at the interchangeable lens 1 has a one-piece structure, in that the stationary tube 140 has a two-piece structure. Additionally, a final gear 185 provided at a driving part 180 has an input side gear 185a, an output side gear 185b and a rotary axis 185c formed integ...

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PUM

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Abstract

To provide a lens barrel having an improved assembly accuracy. The lens barrel is provided with: a stationary part; a movable part provided movably relative to the stationary part, its movement moving a lens relative to the stationary part; a rotary member to transfer to the movable part a driving force for moving the movable part relative to the stationary part; and a supporting part provided integrally with the stationary part to support a rotary axis of the rotary member.

Description

[0001]The disclosure of the following priority application is herein incorporated by reference: Japanese Patent Application No. 2007-010423 filed on Jan. 19, 2007.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to lens barrel and method for manufacturing the same.[0004]2. Description of the Related Art[0005]An interchangeable lens used for a camera system or the like is known, which is provided with a driving unit in which an actuator for driving a lens and a gear train for transferring an output of the actuator have been unitized in advance (for example, see Japanese Unexamined Patent Application Publication No. H6-011636).[0006]However, this interchangeable lens of the prior art may be subject to engagement failure between the gear train and a gear provided for a driven member due to an assembly error of the driving unit with respect to the stationary tube.SUMMARY OF THE INVENTION[0007]An object of the present invention is to provide a...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B15/22G02B13/20
CPCG02B7/102
Inventor WATANABE, TSUNEOOKUYAMA, TEPPEI
Owner NIKON CORP